Hi robebcan
Yes you can keep the same setup.
Very likely you will need to do a repair install.
To prepare for that I would Slipstream an SP3 CD. If you are at SP3 and your XP CD is SP2 then this is very important. DO NOT try to overlay (repair install) an SP3 OS with an SP2 Disk!
I reccomend:
nLite
http://www.nliteos.com/ to do the slipstreaming
and use
Driver Packs
http://driverpacks.net/DriverPacks/ Get them all
The Driver packs will allow most all SATA controllers to be installed without the F6 and a floppy. These driver packs will also install almost any Video Audio and other drivers.
These next first steps will help to possibly eliminate some issues on first boot with new MB.
The very last thing you should do before shutting down to to install new MB.
1. Unhook all external devices USB etc except Mouse and Keyboard
2. Boot to safe mode and uninstall most all HW especially:
Video adapter
Network Adapter
the entire USB Tree
Sound and Audio
Modems
IDE ATA Controlers
And anything else possible except keyboard and mouse
The above will get some of the old HW out of the way for new to install and is the reason I said you "May" be able to boot up the new MB without an overlay repair install!
Avoid letting the computer boot back up as you do not want any HW detections until it boots to the new MB.
It may boot into Safe Mode (it may not) like generic environment. If it does then I would start the XP SP3 CD from Windows and chose Upgrade.
If it will not boot generically then Boot from the CD and do the second offer to Repair where Windows finds an existing installation.
The main reason you may absoloutly need to Overlay/repair install is the SATA drivers.
Do it to it!

And let me know how it comes out!
Mike